{
  "schema": {"language": "vega", "version": "3.0"},
  "width": 200,
  "height": 200,
  "padding": 5,

  "data": [
    {
      "name": "data",
      "values": [
        {"x": 0.5, "y": 0.5, "img": "data/ffox.png"},
        {"x": 1.5, "y": 1.5, "img": "data/gimp.png"},
        {"x": 2.5, "y": 2.5, "img": "data/7zip.png"}
      ]
    }
  ],

  "scales": [
    {
      "name": "x",
      "type": "linear",
      "domain": [0, 3],
      "range": "width"
    },
    {
      "name": "y",
      "type": "linear",
      "domain": [0, 3],
      "range": "height"
    }
  ],

  "axes": [
    {"orient": "bottom", "scale": "x", "tickCount": 5},
    {"orient": "left", "scale": "y", "tickCount": 5}
  ],

  "marks": [
    {
      "type": "image",
      "from": {"data": "data"},
      "encode": {
        "enter": {
          "url": {"field": "img"},
          "width": {"value": 50},
          "height": {"value": 50},
          "x": {"scale": "x", "field": "x"},
          "y": {"scale": "y", "field": "y"},
          "align": {"value": "center"},
          "baseline": {"value": "middle"}
        },
        "update": {
          "opacity": {"value": 1.0}
        },
        "hover": {
          "opacity": {"value": 0.5}
        }
      }
    }
  ]
}